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URAM2MN2 Datasheet(PDF) 2 Page - Vicor Corporation |
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URAM2MN2 Datasheet(HTML) 2 Page - Vicor Corporation |
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2 / 8 page  Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 MicroRAM Data Sheet Rev. 1.1 Page 2 of 8 Set your site on VICOR at www.vicorpower.com PRELIMINARY Parameter Min Typ Max Unit Notes Operating current range No internal current limiting. Converter input must be µRAM2xxx 0.02 20 A properly fused such that the µRAM output current µRAM3xxx 0.02 30 A does not exceed the maximum operating current rating by more than 30% under a steady state condition. Operating input voltage 3.0 30 Vdc Continuous Transient output response 50 mVp-p Step load change; Load current step <1A/µsec see Figures 9, 12, & 15, pp. 6-7 Transient output response Optional capacitance CTRAN can be used Load current step <1A/µsec 50 mVp-p to increase transient current capability; See Figures (CTRAN = 820µF) 1 & 2 on p. 3 and Figures 10, 13, & 16 on pp. 6-7 VHR headroom voltage range(1) See Figures 5, 6 & 7 @ 1A load 325 425 mV See Table 1 for headroom setting resistor values Output ripple 10 mVp-p Ripple frequency 60Hz to 100kHz; optional capacitor Input Vp-p = 100mV 5 mVrms CHR = 100µF required to increase low frequency attenuation as shown in Figures 3a and 3b see Figures 8, 11, & 14, pp. 6-7 Output ripple 10 mVp-p Ripple frequency 100kHz to 2MHz; Input Vp-p = 500mV 5 mVrms see Figures 8, 11, & 14, pp. 6-7 SC output voltage(2) 1.23 Vdc See Table 1 RSC value OR’ing threshold 10 mV Vin – Vout µRAM bias current 60 mA Power Dissipation µRAM2xxx VHR = 380mV@1A 7.5 W Vin = 28V; Iout = 20A µRAM3xxx VHR = 380mV@1A 11.5 W Vin = 28V; Iout = 30A µRAM MODULE SPECIFICATIONS (-20°C to +100°C baseplate temperature) Electrical Characteristics Electrical characteristics apply over the full operating range of input voltage, output power and baseplate temperature, unless otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate. (1) Headroom is the voltage difference between the +Input and +Output pins. RHR = (µRAM +Out/VHR) x 2.3k (see Table 1 for example values) (2) SC resistor is required to trim the converter output up to accommodate the headroom of the µRAM module when remote sense is not used. This feature can only be used when the trim reference of the converter is in the 1.21 to 1.25 Volt range. (see Table 1 with calculated RSC resistor values) RSC = ((µRAM +Out)/1.23V x 1k) – 2k µRAM Out 3.0V 5.0V 12.0V 15.0V 24.0V 28.0V VHR @ 1A 375mV 375mV 375mV 375mV 375mV 375mV RHR Value (ohms) 18.4k 30.6k 73.6k 92.0k 147.2k 171.7k RSC Value (ohms) 0.439k 2.07k 7.76k 10.20k 17.50k 20.76k Table 1—RHR and RSC are computed values for a 375mV case. To compute different headroom voltages, or for standard resistor values and tolerances, use Notes 1 and 2. |
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